<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="style.css" type="text/css"/>
</head>
<body>
<div class="layui-btn-group">
    <button type="button" class="layui-btn">增加</button>
    <button type="button" class="layui-btn">编辑</button>
    <button type="button" class="layui-btn">删除</button>
</div>

<div class="layui-btn-group">
    <button type="button" class="layui-btn layui-btn-sm">
        <i class="layui-icon">&#xe654;</i>
    </button>
    <button type="button" class="layui-btn layui-btn-sm">
        <i class="layui-icon">&#xe642;</i>
    </button>
    <button type="button" class="layui-btn layui-btn-sm">
        <i class="layui-icon">&#xe640;</i>
    </button>
    <button type="button" class="layui-btn layui-btn-sm">
        <i class="layui-icon">&#xe602;</i>
    </button>
</div>

<div class="layui-btn-group">
    <button type="button" class="layui-btn layui-btn-primary layui-btn-sm">
        <i class="layui-icon">&#xe654;</i>
    </button>
    <button type="button" class="layui-btn layui-btn-primary layui-btn-sm">
        <i class="layui-icon">&#xe642;</i>
    </button>
    <button type="button" class="layui-btn layui-btn-primary layui-btn-sm">
        <i class="layui-icon">&#xe640;</i>
    </button>
</div>
http://layui-doc.pearadmin.com/doc/element/button.html
http://layui-doc.pearadmin.com/doc/index.html
</body>
</html>